arch/mips/pci/pci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
   5  * Copyright (C) 2011 Wind River Systems,
   6  *   written by Ralf Baechle (ralf@linux-mips.org)
   7  */
   8 #include <linux/bug.h>
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/memblock.h>
  12 #include <linux/export.h>
  13 #include <linux/init.h>
  14 #include <linux/types.h>
  15 #include <linux/pci.h>
  16 #include <linux/of_address.h>
  17
  18 #include <asm/cpu-info.h>
  19
  20 unsigned long PCIBIOS_MIN_IO;
  21 EXPORT_SYMBOL(PCIBIOS_MIN_IO);
  22
  23 unsigned long PCIBIOS_MIN_MEM;
  24 EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
  25
  26 static int __init pcibios_set_cache_line_size(void)
  27 {
  28         unsigned int lsize;
  29
  30         /*
  31          * Set PCI cacheline size to that of the highest level in the
  32          * cache hierarchy.
  33          */
  34         lsize = cpu_dcache_line_size();
  35         lsize = cpu_scache_line_size() ? : lsize;
  36         lsize = cpu_tcache_line_size() ? : lsize;
  37
  38         BUG_ON(!lsize);
  39
  40         pci_dfl_cache_line_size = lsize >> 2;
  41
  42         pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
  43         return 0;
  44 }
  45 arch_initcall(pcibios_set_cache_line_size);
  46
  47 void pci_resource_to_user(const struct pci_dev *dev, int bar,
  48                           const struct resource *rsrc, resource_size_t *start,
  49                           resource_size_t *end)
  50 {
  51         phys_addr_t size = resource_size(rsrc);
  52
  53         *start = fixup_bigphys_addr(rsrc->start, size);
  54         *end = rsrc->start + size - 1;
  55 }